Test the riskiest assumption first: Lean Pivot principles for transformation leaders

The Lean Pivot was written for anyone turning uncertainty into a growing business. Its principles travel well. Inside established firms, the same habits of testing the riskiest assumption first and deciding with evidence can save a transformation programme months of effort.

Start-up thinking, established firms

I wrote The Lean Pivot as a practical playbook for testing ideas and changing direction with evidence. Many readers have been founders. Some of the most useful conversations since publication, though, have been with people leading change inside large, regulated organisations, where the cost of building the wrong thing is measured in years.

The principles below come from the book. The examples come from transformation work.

Name the riskiest assumption

Every programme rests on assumptions: that users will adopt the new process, that a vendor's product fits, that the data is good enough, that the saving is real. Typically, these sit quietly in the business case and are tested only when delivery is well under way.

A simple exercise helps. List the assumptions, then ask which one, if wrong, would hurt most. That is where the first piece of work should go.

Test it cheaply, and early

Once the riskiest assumption is named, design the smallest test that could prove it wrong. That might be a one-week prototype in front of real users, a short mapping exercise to check where cost really sits, or a vendor proof of concept with tightly defined success criteria. The aim is learning, quickly and at low cost.

Decide with evidence

Agree in advance what result would mean go, change or stop. This takes the politics out of the decision. When the evidence arrives, the conversation focuses on what it shows.

Pivot without stigma

In many organisations, changing direction feels like failure, so programmes continue long after the evidence has turned. The book argues for the opposite view: a well-timed pivot is a sign of good management. Building review points into the plan makes changing course a normal, expected step.

Bringing it into your programme

• At initiation: list the assumptions and pick the riskiest one to test first.
• In the plan: add explicit decision points with agreed evidence thresholds.
• In governance: report what has been learned alongside what has been delivered.

These habits shape every PTR engagement, from AI adoption to regulatory change. If you would like to go deeper, The Lean Pivot sets out the full method, and you can read more about how we work.